Question
The ratio of the speed of boats ‘A’ and ‘B’ in
still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in still water. If boat ‘A’ takes 10 hours to travel 500 km downstream, then find the time taken by boat ‘B’ to travel 70 km upstream and 275 km downstream. (Note: Both the boats are rowing in the same stream.)Solution
Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 500/10 Or, 10x = 50 Or, x = 5 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 35 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 55 km/hr Required time taken = (70/35) + (275/55) = 2 + 5 = 7 hours
Who was recently conferred with New Zealand's second highest honour?
India has signed Comprehensive Economic Partnership Agreement (CEPA) with which countries
Which ruler is credited with founding the Satavahana dynasty?
ACME Group and IHI Corporation signed an agreement for the supply of green ammonia. Where is the green ammonia supplied from, and what is the agreement'...
The Union Cabinet has approved viability gap funding for battery storage system.Which of the following statements is/are true with respect to this?
...What is the chemical symbol for gold?
On which date International Day of Women and Girls in Science is celebrated annually?
How many days does the directive suggest for the auto-escalation of complaints to the Internal Ombudsman (IO) if they are partly or wholly rejected by t...
Which national park in India is the sole habitat for the Asiatic Lion?
Which country is home to the 5,000-year-old Patagonian cypress tree, officially recognized as the world's oldest and nicknamed "Great Grandfather,"?
Relevant for Exams:
Hey, Don't leave. If you have any queries regarding any exam let us know here.
